Portable automatic screener.



V- F. CARL & G. P. DALY. PORTABLE AUTOMATIC SCREENER.

APPLICATION FILED APR. 30. 1914.

Patented Apr. 11,1916.

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. INVENTORS VICTOR l: CflRL wmvassss:

GEORGE D/JL) dub ATTZRNEYV THE COLUMBIA PLIANOGRAPH C0-, WASHXNGNN, D C- v o'ron r. cam. AND GEORGEP. DALY, or nos'ron, massaoiius'nrrs.

PORTABLE AUTOMATIC SCREENEB.

To all whom it may concern:

'Be it known that we, V oToR States, and residents of Boston, in the county of Sufiolk and Commonwealth of Massachusetts, have invented an Improvement 1n Portable Automatic Screeners, of which the following description, in Connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts in each of the several views. g

This-invention relates to screening apparatus adapted to screen and clean material of granular or lump form such as cofiee, grain, and various farm products.

The prime object of the invention is to provide an improved apparatus of'this type adapted to thoroughly and rapidly screen the material automatically and without the use of any hand manipulation or motive power of any kind.

A further object isto provide anefiective screener that is relatively very compact and presents a large screening area contained within a low down housing or support.

The above and other objects and features of the invention will be better understood from the following detailed description taken in connection with the accompanying drawings and will be thereafter pointed out in the appended claim.

Referring to the drawings: Figure 1 shows in side elevation a preferred embodiment of my improved apparatus, a portion of the inclosing housing being broken away to better show the arrangement of the screening mechanism; and Fig. 2 is an end view with the housing similarly broken away. p

A suitable inclosing housing is indicated at 10 which may be of any suitable form in cross section though preferably rectangular and oblong, and of a height to accommodate the several parts of the mechanism to be described. In the top of this housing is fixed a receiving hopper 11 which may be formed with sloping walls adapted to direct the material down on to a screen 12 suitably mounted in the upper portion of the housing and sloping downward from the top of the housing at one side at a degree adapted to cause the material to slide over the same by gravity as it falls thereon from the bottom of the hopper 11. It will be understood that the bottom of hopper 11 is for this pur- Specifieation of Letters Patent.

F. CAI-111 and Gnoncn P. DALY, citizens of the Unlted' pose open over a. substantial section of the sereenlg. andthe hopper 'is'preferably pro vided w th spaced apartseparator plates or -ablyhas not only a screen bottom but also screen sides as indicated at '14 to better guide the material along on its way. The screen 12 is shown as extending most of the way across the housing and at its lower end ltemptiesinto a similar sloping screen 15 extending from its receiving point downward across the housing in zig-zagrelation to the screen 12. At the lower end of screen '15 there 15 mounted in receiving relation thereto a third screen 16 which likewise slopes downward from its receiving point in opposite direction to the screen 15. It will Patented Apr. 11, 1916. 7

Application filed April 30, 1514. Serial No. 835,480. I

be understood that these three screens typify any desired number that may be found useful or desirable for. the particular material to be screened, though the number three as shown has been found suitable for most materials. The screen 16 is shown as having a delivery spout 17 extending without the housing to empty the screened material into a receiving receptacle.

In accordance with our invention we preferably provide in the path of the material as discharged from one screen into a succeeding one, shown as between the discharge end of screen 15 and the receiving end of screen 16, a freely rotatable wheel 18 journaled at 19 and having a series of vanes 20; shown as four in number of wire mesh or the like. It will be understood that these vanes are of a width to extend across the delivery end of screen 15 and that they form open pockets to receive the material as it is discharged from the screen. As the vmaterial is discharged from the lower end of screen 15 by gravity with some little force it strikes against the vanes 20 causing the wheel to rotate rapidly in the direction of the arrow. This causes the material to be distributed more evenly about the receiving end of screen 16 and by contributing to the agitation of the material and preventing its clogging up, materially aids in the screening action of screen 16. To insure that the wheel 18 shall be in position so that one of the vanes 20 will be in the path of the discharging material at the beginning of thescreening operation so that the wheel rotation will be properly initiated, it is desirable that a smallcounterweight 21 be applied to the wheel at one side so as to hold a vane in the path of the material. The dust and screenings which drop from the several screens may be caught in a drawer 22 mounted in the base of the housing and we preferably provide a deflector chute 23 leading into this drawer so as to catch the screenings from the upper screens and lead theminto this drawer. The tops of the intermediate and lower screens may be covered at their lower portions as shown so as to revent the screenings that drop from the screens above from discharging thereinto.

It will thus be observed that we produce an exceedingly compact low down construction wherein the material is bounced and agitated as it is discharged from the separator into the first screen and from each screen into the next so that a maximum of screening action is obtained with a minimum of screening surface. Further, the wheel 18 which in use rotates rapidly as the material is projected thereagainst, largely contributes to the continued agitation of the material and makes the screening surfaces upon which the material is projected more effective.

7e are aware that the invention can be embodied in other specific forms as to details without departing from the spirit or essential attributes thereof and we therefore desire the present embodiment to be considered as illustrative and not restrictive. referring rather to the appended claim to indicate the scope of the invention.

Having described our invention, what we claim as new and desire to secure by Letters Patent is:

Screening apparatus of the kind described, comprising a plurality of sloping screens extending in zig-zag relation vertically so that material is discharged by gravity from one thereof into the upper end of the next, a hopper having a separator device therein above the topmost screen to discharge thereonto, and a freely rotatable wheel having radial screen vanes in the path of material discharged from one screen onto another, said wheel having provision for counterweighting for the purpose stated.

In testimony whereof, we have signed our names to this specification, in the presence of two subscribing witnesses.

VICTOR F. CARL. GEORGE P. DALY. Witnesses:

CLYDE L. RoeERs, LOUISE A. JORDAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents. Washington, D. C. 

